37216357921 has 4 divisors (see below), whose sum is σ = 37600031812. Its totient is φ = 36832684032.

The previous prime is 37216357909. The next prime is 37216357951. The reversal of 37216357921 is 12975361273.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13885322896 + 23331035025 = 117836^2 + 152745^2 .

It is a cyclic number.

It is not a de Polignac number, because 37216357921 - 2⁷ = 37216357793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (37216357951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191836800 + ... + 191836993.

It is an arithmetic number, because the mean of its divisors is an integer number (9400007953).

Almost surely, 2^37216357921 is an apocalyptic number.

It is an amenable number.

37216357921 is a deficient number, since it is larger than the sum of its proper divisors (383673891).

37216357921 is an equidigital number, since it uses as much as digits as its factorization.

37216357921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383673890.

The product of its digits is 476280, while the sum is 46.

The spelling of 37216357921 in words is "thirty-seven billion, two hundred sixteen million, three hundred fifty-seven thousand, nine hundred twenty-one".